The Shimano Deore XT CS-M8100 12-speed cassette is optimized with rider-tuned wide range and close step gear combinations for MTB excellence. FEATURES: Shift ramp designs provide fast and smooth shifts by HYPERGLIDE+ technology Light and stiff construction reduces cassette inertia resulting in faster acceleration and increased chain security Designed with a Shimano Micro Spline body that features smaller and more widely distributed splines to limit cog damage on freehub The CS-M8100 cassette meets durability requirements for E-MTB applications SPECS: Color: Silver/Black Cassette Body Type: Shimano Micro Spline Designed for ebike: Yes Drivetrain Speeds: 12 Cassette Cogs: 10-12-14-16-18-21-24-28-32-36-40-45 Weight: 461 Range: 10-45